Match start of every new line with JavaScript regex

I have a line with possible \n

in them. Think:

 Foo1
  Foo2
Foo3  Foo4.

      

        
        
        
      

    

I want to replace  

at the beginning of each line, but above is one line. ^nbsp;

matches only the first  

before Foo1

. I want to do at the beginning of any new line, look  

. Any ideas?

So, I want the regex to match the first two  

above, but not the third.